<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>左侧固定右侧自适应</title>
</head>
<body>
<div class="left"></div>
<div class="right"></div>
</body>
</html>
<style>
	*{
		margin:0;
		padding: 0;
		list-style-type: none;
	}
	.left{
		height: 200px;
		width: 200px;
		background: #00b3c0;
		float: left;

	}
	.right{
		height: 200px;
		width: 100%;
		background: rgba(100,40,80,.3);
	}
</style>